client.js

var socket = new Phoenix.Socket(PewMiddle.config.socketPath);

PewMiddle.requestGame = function(username, callback) {
    socket.join(PewMiddle.config.channel, "lobby", {username: username}, function(channel) {
      var player = null;
        channel.on("player:created", function(message) {
          player = message;
        });
        channel.on("game:created", function(game) {
          callback(game.id, player);
          channel.leave();
        });
    });
};

PewMiddle.joinGame = function(gameId, player, eventReceiver, callback) {
  console.log(player);
    socket.join(PewMiddle.config.channel, gameId, player, function(channel) {
        channel.on("joined", function(message){
          channel.send("ship:target", {thin: "one"});
          channel.send("ship:move", {thin: "two"});
          channel.send("ship", {message: "also ship"});          
        }

        channel.on("ship:move", function(message) {
            eventReceiver.shipMove(message.shipId, message.coordinates);
        });
        channel.on("ship:targeted", function(message) {
            eventReceiver.shipTarget(message.shipId, message.targetShipId);
        });
        channel.on("ship:create", function(message) {
            eventReceiver.shipCreate(message.ship);
        });
        channel.on("ship:destroy", function(message) {
            eventReceiver.shipDestroy(message.shipId);
        });

        callback({
            moveShip: function(id, coordinates) {
                    channel.send("ship:move", {
                        shipId: id,
                        coordinates: coordinates
                    });
                },
            targetShip: function(id, targetShipId) {
                    channel.send("ship:target", {
                        shipId: id,
                        targetShipId: targetShipId
                    });
                }
        });
    });
};

game.ex

defmodule Spacegame.GameChannel do
  use Phoenix.Channel

  def join(socket, "lobby", %{"username" => username}) do
    opponent = List.first(Players.lobby)
    player = Player.new(username, socket)
    Players.put(player) 
    reply socket, "player:created", Player.json(player)
    
    # Find you an opponent
    if (opponent != nil) do
      game = Game.new([player, opponent])
      Enum.each(game.players, fn(p) -> 
        Players.put(Map.put(p, :in_game, true))
      end)
      Games.put(game)
      reply socket, "game:created", Game.json(game)
      reply opponent.socket, "game:created", Game.json(game)
    end
    {:ok, socket}
  end

  def join(socket, topic, %{"id" => id, "username" => username}) do
    game = Games.get(topic)

    me = List.first(Enum.filter(game.players, fn(player) -> player.id == id end))

    me = Map.put(me, :connected, true)
    me = Map.put(me, :socket, socket)
    Players.put(me)

    if(Enum.all?(game.players, fn(player) -> Players.get(player.id).connected end)) do
      Enum.each(game.players, fn(player) ->
        reply Players.get(player.id).socket, "start", %{}
      end)
    end
    reply socket, "joined", %{}
    {:ok, socket}
  end

  def event(socket, "ship", message) do
    IO.puts "OMG HERE"
    IO.inspect socket
  end

  def event(socket, "ship:target", message) do
  end
  
end

router.ex

defmodule Spacegame.Router do
  use Phoenix.Router
  use Phoenix.Router.Socket, mount: "/ws"
  channel "game", Spacegame.GameChannel

end